A powerful typhoon is expected to make landfall in west Japan raising the risk of more hardship for a region battered by deadly floods in July, and prompting authorities to issue evacuation advisories for more than 60,000 people.
The centre of Typhoon Cimaron was about 200km south of Shikoku, the smallest of Japan's four main islands, at 3pm (AEST) and heading north-northwest.
It was likely to cut across western Japan on Thursday evening, the Japan Meteorological Agency said.
"There will be heavy rain in areas that have yet to fully recover," Prime Minister Shinzo Abe said at a meeting of the government's disaster response headquarters.
"In order to prevent a secondary disaster, do not be afraid of false alarms and evacuate early and do everything you can (to protect yourself)," he added.
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Shikoku would likely see as much as 800mm of rain in the 24 hours to noon on Friday. Central Japan, including the industrial region of Nagoya, could see up to 600mm of rain in the same period, the agency said.
At least three municipalities on Shikoku issued evacuation advisories for their 65,000 residents and Prime Minister Shinzo Abe urged residents to take precautionary measures early.
Japan has been hit by various extreme weather since the beginning of July with record-breaking heat and the devastating floods and landslides in the west that killed more than 200 people.
